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PCE-WM 1 Humidity Detector
Measures absolute and relative humidity in % and g/m³,
ambient temperature, dew point with an external sensor

The PCE-WM 1 humidity detector has a wide range of applications and can determine relative humidity in % and absolute humidity in g/m³ with a high accuracy. This humidity detector  measures such ambient condition as relative humidity and ambient temperature, and it can also measure surface temperature with an external sensor which comes with the device. The humidity detector can calculate dew point as well as relative humidity in g/m³. This device is used extensively in the construction sector and in food industry to develop new products and ensure quality and freshness. The humidity detector comes calibrated from the manufacturer but it is not certified. DIN ISO calibration from the accredited laboratory can be ordered, or you can contact us. We will perform an annual recalibration to meet ISO standards. Here you will find an overview of all the humidity detectors which will suit your needs.

- Measures humidity and ambient temperature
  using an external temperature sensor and an
  external sensor for measuring surface                temperature

- Shows temperature and absolute and relative     humidity in % or g/m³

- Determines dew point

- ISO 9000 laboratory calibration and certificate
  (optional)

- Minimum, maximum values and Peak Hold

- Designed for the food industry to control am-
  bient conditions and for ventilation problems in
  buildings

               View or print the user manual
                                   PCE-WM 1 humidity detector: user manual


PCE-WM 1 humidity detector

PCE-WM 1 humidity detector
Technical specifications (the same for both devices)
Measurement range
                               Temperature
                               Relative humidity
                               Absolute humidity
                               Dew point temperature

0 to 50°C
10 to 95% r.h.
0.5 to 74.4 g/m³
-27.3 to 47.9°C
Resolution               Temperature
                               Relative humidity
                               Absolute humidity
0.1°C
0.1%
0.1 g/m³
Precision                 Temperature
                               Relative humidity
                               Absolute humidity
± 1K
± 3%
± 2%
Response time approx. 10 s
Minimum, Maximum values and Peak Hold yes
External temperature sensor 1.1 m cable
Power 9 V battery
Operating conditions -20 to 50°C/0 to 100% r.h.
Dimensions (device) 165 x 80 x 33 mm
Dimensions (sensor) 150 x 30 mm (ambient temperature/humidity)
50 x 30 mm (surface temperature)
Weight 380 g
Dew point/Dew point temperature

Dew point temperature is defined as the actual content of water vapour in the air found at the maximum level (100% of relative humidity of air). Dew point is therefore an independent measure from the actual temperature. One way of measuring dew point is freezing a metal pipe until moisture forms on its surface. When water vapour appears, the metal has reached dew point temperature. The most common method to measure dew point is to use a wet thermometer together with a dry thermometer. The wet thermometer shows dew point and with the ambient temperature, relative humidity can be determined. This device does this calculation automatically.

Relative humidity/Absolute humidity in % or g/m³

The expression "relative humidity" represents the degree of relative saturation of the air, i.e. what percentage of the maximum saturation of air moisture is given at this specific temperature. The scientific definition of "relative air humidity" refers to the relationship of the partial pressure of water vapour with respect to the pressure of water saturation. The word air doesn't appear in the definition as relative air humidity is totally independent from the existing quantity of nitrogen or oxygen. The saturation vapour pressure of water vapour remains the same regardless of it being measured in a vacuum or high air pressure. To show if the air is dry or humid, relative air humidity is far more significant than absolute humidity in grammes of water per kilogram of the air. In certain volumes, air humidity in absolute terms can be shown in g/m³. This image shows the relationship between relative humidity, absolute humidity and temperature:
                     The PCE-WM 1 humidity detector introduces the concepts in the graphic above.
The PCE-WM 1 humidity detector introduces the concepts in the graphic above. The device determines relative humidity, ambient temperature, surface temperature and calculates dew point and air water content in g/m³. These values can be seen on the display with the help of the selecting dial. The humidity detector can be recalibrated and certified to meet ISO standards, and thanks to its accuracy, the device will provide the same results.

Delivery content:
1 x PCE-WM1 humidity detector, 1 x external combined sensor (for ambient temperature and relative humidity), 1 x external sensor for surface temperature, 1 x battery, 1 x carrying case and user manual

Optional accessories

ISO laboratory calibration certificate
For companies that wish to incorporate the device into their set of internal quality control tools or for annual recalibrations (if not using the calibration kit). The ISO certificate includes a calibration and a document containing all the taken readings.

ISO calibration certificate for a humidity detector

Replacement combined sensor
The combined sensor comes with the device (it measures ambient temperature and relative humidity) and can be recalibrated numerous times. After some years of use, however, it can be replaced with a substitute sensor.


PCE-WM 1 humidity detector: replacement combined sensor

Replacement surface temperature sensor
If the surface temperature sensor that comes with the the humidity detector eventually fails, a replacement can be ordered.

PCE-WM 1 humidity detector: replacement surface temperature sensor

technical specifications for the PCE-WM 1 humidity detector. return to homepage
Here you will find an overview of all the measuring instruments available at PCE Instruments.

Contact:
PCE Instruments UK Limited
Units 12/13 Southpoint Business Park
Ensign Way, Southampton
United Kingdom, SO31 4RF
Phone: +44(0) 23 809 870 30
Fax: +44(0) 23 809 870 39

Contact:
PCE Americas Inc.
711 Commerce Way suite 8
Jupiter 33458 FL
USA
Phone: +1-410-387-7703
Fax: +1-410-387-7714

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Below you will find an overview of the different product groups of measuring instruments

 Absolute Humidity Meters
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